Oh Yeah,
If you want to practice doing 3d toolpaths also, you could go to mecsoft.com who make visualmill and look for the link to "FreeMill". It will do 3dm files and has a simple wizard driven interface thats a great place to start and generate code to send to your machine. It may be a little buggy as it is a very simple version so if you dont set things up right it crashes. (At least for me) but that is also a great learning tool.

They also have some higher end stuff to move to later. I havnt used it but they have been around they even have a rhino plugin for cam.